At the bottom right-hand corner of the screen and click the Restore buttonĭisk Utility will restore the OS X Install DVD or disk image to the USB drive this process may take anywhere from 20 minutes to an hour depending on how quick the Mac is.Drag-and-drop the Mac OS X Install Drive disk into the Source box.Drag-and-drop the USB drive's partition into the Destination box.In the center of the window you'll see two boxes: one labeled Source and another Destination.